What do I do if I develop side effects? If you develop new symptoms after having started taking nutritional supplements, talk to the medical advisor who recommended the supplements. If you are experiencing symptoms typical of the body cleansing itself of toxins, it is usually sufficient to take half the dose for two weeks after which you can go back up to your initially prescribed dose. If in doubt or if symptoms do not disappear after a few weeks, contact your medical professional. In case of allergy, you should immediately stop taking the supplements and seek advice from a medical professional experienced in nutritional medicine.